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Net Pension Assets - Summary of Net Pension Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Pension assets | $ 23,794 | $ 25,946 |
Employee benefits liability | (20,609) | (17,120) |
Net pension asset | 3,185 | 8,826 | $ 6,050
Post employment benefits [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Employee benefits liability | (19,997) | (16,498) |
Other employee benefits [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Employee benefits liability | $ (612) | $ (622) |

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- Definition The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of liabilities other than the actuarial present value of promised retirement benefits in retirement benefit plans. [Refer: Actuarial present value of promised retirement benefits] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_a_v&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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